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I did a quick ROI equation. If a car isn't driven much then it's going to take a long time to recoup the money spent on the heater. The more you use it the faster you will make the money back. I drove 1941 miles last 4 tanks with the heater every chance I could get. Without it I would have used 3.5 gallons more. 3.5 gallons times 3.53( price of gas now) is a little over 12 dollars. My 75 dollar investment divided by the 12.35 I saved would mean I would have to drive that 1941 miles 6.07 times to break even. That comes to 11700 miles in winter weather averaging 48.5 mpg. Let's round it up to 12000 since I didn't include the electrical cost of the house yet. (1.2 dollars a month)
I drive 3500 miles a month so 12000 divided by 3500 would be 3.42 being more conservative I'll round that up to 3.5 months. So I can expect to pay my investment off in 3.5-4 months of winter driving.
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